Answers
Mass of Helium = 4
Helium = 55 liters
How many moles = ?
_____________________________________SOLUTION:By the equation(AT S.T.P) of,
Moles = [tex]\frac{Given\ Volume}{22.4\ dm^3}[/tex]
Substitute the values,
Moles = [tex]\frac{55}{22.4}[/tex]
Simplify the fraction,
Moles = 2.5 grams/moles
_____________________________________Best Regards,'Borz'
Related Questions
True or False:
All stars are the same color.
Answers
Answer:
False
Explanation:
They are not the same color since they do not all have the same temperature
Temperature defines their color
All matter has both physical and chemical properties.
True or False
Answers
Answer:
F
Explanation:
MARKING BRAINLIEST!!
Students learned that the job of the nucleus of an animal cell is to control all of the cell's activities.
A. Which organ system has a similar function?
B. Respiratory system
C. Circulatory system
D. Nervous system
Muscular system
Answers
1. Mixing is a physical change.
True or false
Answers
Answer:
false it is a chemical change
Animals have to eat other things to get their food, but plants can make it themselves. Plants are known as:
A. consumers
B. producers
C. chloroplasts
D. glucose
Answers
Answer:
Producersssssssssss
For the reaction H2(g) + 12(g) = 2HI(g), Kc = 50.2 at 445°C. If
[H2] = [12] = [HI] = 1.75 x 10-3 Mat 445°C, which of the
following is true based on the above?
Answers
Qc < Kc, the reaction proceeds from left to right to reach equilibrium
Further explanationGiven
K = 50.2 at 445°C
[H2] = [I2] = [HI] = 1.75 × 10⁻³ M At 445ºC
Reaction
H2(g) + I2(g) ⇔2HI(g)
Required
Qc
Solution
Qc for the reaction
[tex]\tt Qc=\dfrac{[HI]^2}{[I_2][H_2]}\\\\Qc=\dfrac{(1.75.10^{-3})^2}{1.75.10^{-3}\times 1.75\.10^{-3}}=1[/tex]
Qc < Kc ⇒ reaction from left(reactants) to right (products) (the reaction will shift on the right) until it reaches equilibrium (Qc = Kc)
PLEASE HELPPPP
5. When calcium carbonate is heated, it decomposes to form solid calcium oxide and carbon dioxide gas. How many grams of carbon dioxide will be produced if 23.83 g of calcium carbonate reacts completely? (5pts)
CaCO3 → CaO + CO2
100.09g 56.08g 44.01g
6. The first step in the industrial manufacture of nitric acid is the reaction of nitrogen trihydride with oxygen to produce nitrogen monoxide and water. If 824 g of nitrogen trihydride are used, how many moles of nitrogen monoxide will be produced? (4pts)
4NH3 + 5O2 → 4NO + 6H2O
17.04g 32.00g 30.01g 18.02g
7. The reaction between 64.00 g solid sodium metal and 80.00 g iron (III) oxide produces sodium oxide and metallic iron. (15 pts)
6Na + Fe2O3 → 3Na2O + 2Fe 22.99g 159.70g 61.98g 55.85g
Determine (Clearly label each answer)
the limiting reactant
the mass of solid iron produced
the mass of excess reactant that remains after the reaction is complete.
8. When excess potassium sulfate is added to a solution containing 0.500 g silver nitrate, solid silver sulfate is formed along with potassium nitrate. (7 pts)
K2SO4 + 2AgNO3 → Ag2SO4 + 2KNO3
174.27g 169.88g 311.81g 101.11g
Determine the theoretical yield of the silver sulfate precipitate.
If 0.435 g of silver sulfate is obtained in the lab, calculate the percent yield
Answers
Answer:
explain futher pls
Explanation:
As the amplitude decreases in a wave, the energy increases.
Lesson 4.07
Question 6 options:
True
False
Answers
Answer:
False
Explanation:
The relationship between energy and amplitude can be written as eαa^2
This means that the energy of a wave is directly proportional to the square of the amplitude.
ANSWER THIS QUESTION AS QUICK AS YOU CAN YOU WILL GET BRAINLY AND PIONTS PLEASE HELP ASAP!!!!!!!!!!!!!!!!!
Which of the following is NOT true about comparisons between analog and digital signals?
Question 3 options:
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are more prone to distortion.
Analog signals are more prone to distortion.
Answers
Analog signals are used to convert sound waves into electronic signals.
Answer:
Explanation: Analog signal is continuous in nature as it is well defined for every specific time. More specifically, it is the one defined continuously for a range of values with time. These are represented as a sinusoidal waveform. The figure below represents an analog signal:
analog signal
As we can see here that the signal is continuous in nature as its every value is specified for each particular interval of time, thus, is referred as the continuous-time signal. For the purpose of recording the analog signals, the actual signal must be preserved as only in that case we can record the accurate analog signal.
However, whenever in any application there arises a need to change an analog signal into a digital one then through sampling this can be achieved. In the sampling technique, this signal is sampled at certain fixed time intervals and the sampled voltage is converted into digital values.
Definition of Digital Signal
A type of signal which is non-continuous in nature as it is defined only for a set of discrete times is known as a digital signal. More simply, we can say, it is specified at some particular time instants only. Thus, here the information is represented as a set of discrete values. The figure given below shows the signal representation in digital form:
digital signal
Here it is clear that the data is discretely positioned in time axis thus is shown in the form of bits i.e., 0 and 1. This means that here the signal performs the sudden transition between 0 and 1 where these two values correspond to the two voltage levels. For the purpose of recording the signals, in the digital one, only the samples of the actual signal are taken and not the whole signal.
Key Differences Between Analog and Digital Signal
Analog and digital signals are differentiated mainly on the basis of their way to carry the information. Analog signals represent the information as a continuous function of time. As against, digital signals are represented discretely at specific time intervals.
Analog signals deteriorate more easily than digital one as their susceptibility towards noise is higher.
The devices that operate on an analog signal need more power for transmission and reception than the devices that work on the digital signal.
The information represented by the analog signal is comparatively more accurate than the digital signal due to its continuous range of values.
Analog signals are transmitted at a slower rate than digital signals as the information holds more values thus is precise.
An analog signal is defined by the amplitude, phase, frequency, etc. While the digital signal is mainly associated with bit rate, bit intervals, etc.
The sinusoidal representation of the analog signal makes it difficult to understand or get decoded thus encryption is not required in analog signals. But as the digital signals are in the form of square waves, thus, it can be decoded easily hence need to be encrypted for secured communication.
On the basis of processing, it is said that the continuous nature of the signal offers easy processing of the analog signal. However, the discrete nature of the signal offers difficultly in the processing of the digital signal.
Conclusion
Thus, the above discussion concludes that due to the way of representing the signal, the two are differentiated. And because of this, the two types of signals possess different properties and are used in different applications. Like analog signals are used in radio wave transmission and reception whereas digital signals are used in the field of digital electronics.
A spaceship is traveling through space. Suddenly, its speed increases. What can
you say about the kinetic energy of the spaceship?
A. The kinetic energy increases as its speed increases.
B. The kinetic energy decreases as it is converted into speed.
C. The kinetic energy remains the same because speed and kinetic energy are not
related.
D.There is no way to know what happens to the kinetic energy.
Answers
Answer:
A. The kinetic energy increases as its speed increases.
Explanation:
The kinetic energy of an object is energy possessed by an object by virtue of its motion.
Now, kinetic energy of a moving body is given by;
KE = 1/2 mv^2
Where;
m = mass of the body
v = velocity (speed) of the body
It follows that if the mass of the spaceship is constant, a sudden increase in speed leads to a corresponding increase in the kinetic energy of the spaceship in accordance with the relationship show above.
Answer:
You'll speed up! A. Because the kinetic energy increases as its speed increases.
Explanation:
Cherylanne mixes together Chemical A and Chemical B in a test tube, forming Chemical C. The mixture instantly turns cool to the touch. She then adds Chemical D, and the reaction becomes hot and explodes. What can be known about this situation? Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction. Chemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction. Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction. Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.
Answers
Answer:
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.
Explanation:
The reaction that produced chemical C is an endothermic reaction whereas, the reaction between C and D is an exothermic one.
An exothermic change is one in which heat is liberated to the surroundings. So the surrounding becomes hotter at the end of the reaction.
An endothermic reaction is a change in which heat is absorbed from the surrounding and hence the surrounding colder at the end of the change.
We can see that the first reaction is endothermic. The second reaction is exothermic.Answer:
A or 1Explanation:
Chemicals A and B form an endothermic reaction, and chemicals C and D form an exothermic reaction.the rest are wrongChemicals A and B form an exothermic reaction, and chemicals C and D form an endothermic reaction.
Chemicals A and C form an endothermic reaction, and chemicals B and D form an exothermic reaction.
Chemicals A and B form an exothermic reaction, and chemicals B and D form an endothermic reaction.
Define symbole and valeny.
Answers
Answer:
Chemical symbol
This is used to identify an element without having to write the full name and as such is a designation for the element. It is used in chemical reactions and is usually either one or two letters. Some symbols are, Iron - Fe, Hydrogen - H and Oxygen - O.
Valency
This refers to the capacity of an element to combine with another to form a compound. It is measured by the number of electrons that an atom of an element gains, looses or shares when a chemical reaction involving it takes place.
Use the activity series below to predict whether the following reactions will take place.
Answers
Answer: I HAVE ATTACHED PROOF SO DONT REMOVE MY ANSWER, MODS.
1. NO
2. NO
Answer: 1. NO 2. NO
Explanation: Just did it and got it correct.
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team. What is the slowest speed he can run in order to qualify for the all-star team?
Answers
Explanation:
It is given that,
A football player has to run 60 meters in 5 seconds or less in order to make the all-star team.
We need to find the slowest speed he run in order to qualify for the all-star team. Let it is v. It can be calculated as follows :
v = d/t
= 60 m/5 s
= 12 m/s
It means his slowest speed is 12 m/s and he should increase his speed in order to qualify for the all-star team.
two examples for magnetic and nonmagnetic materials
Answers
Answer:
Magnetic: Iron and nickel
Nonmagnetic: Rubber, feathers and/or leather
Explanation:
Hope this helps!
Gas stoichiometry a sample of methane gas having a volume of 2.80 L at 25c and 1.65 atm was mixed with a sample oxygen gas having a volume 35.0L at 31c and 1.25 atm . The mixture was then ignited to form carbon dioxide and water . Calculate the volume of co2 formed at a pressure of 2.50 atm and a temperature of 125 c
Answers
Answer:
2.47 L. CO2
Explanation:
First, let's establish what we need to find. The volume of CO2 formed at a pressure of 2.50 atm and a temperature of 125 C. Now, don't let this overwhelm you. To find the volume of CO2 formed, we must first find the amount of CO2 formed.
But to find the amount of CO2 formed, we have to write out the equation for this reaction. The type of reaction depicted here is combustion, where oxygen gas reacts with a substance to form carbon dioxide and water. And we also know that this equation must be balanced, according to the Law of Conservation of Matter. It is as follows:
CH4 + 2 O2 => CO2 + 2 H2O.
Now that we have the equation of the reaction, we can now find which of the two reactants is the limiting reactant. To do this, we need to convert the volumes of methane and oxygen gas to moles. Simply use the Ideal Gas Law to do this, and you get:
Methane Gas: .189 mol | Oxygen Gas: 1.75 mol
Using the equation, we can then see that methane gas is the limiting reactant.
We know, also due to the equation that 1 mol of CO2 is produced for every mol of methane gas. This gives us the answer of .189 mol of CO2 produced. But remember, the question asks us for the volume of CO2 produced, so we must apply the Ideal Gas Law once again, getting the answer of 2.47 L. CO2.
Note: Please remember to use significant figures during your calculations, and if you have any questions, feel free to post them down below.
Hey please answer this thanks.
Answers
Explanation:
Percentage composition of oxygen = (80/134) * 100% = 59.7%.
What is the energy of a photon (J) that has a wavelength of 105 nm?
Answers
Answer:
3.46
⋅
10
−
19
J
The energy of a photon is proportional to its frequency, as stated by the Planck - Einstein's equation
E
=
h
⋅
ν
, where
E
- the energy of the photon
h
- Planck's constant, equal to
6.626
⋅
10
−
34
J s
ν
- the frequency of the photon
Now, notice that you are given the wavelength of the photon,
λ
. As you know, frequency and wavelength have an inverse relationship described by the equation
λ
⋅
ν
=
c
, where
c
- the speed of light in vacuum, approximately equal to
3
⋅
10
8
m s
−
1
This means that the relationship between energy and wavelength looks like this
λ
⋅
ν
=
c
⇒
ν
=
c
λ
E
=
h
⋅
c
λ
Another important thing to notice here is that the wavelength of the photon is given in nanometers,
nm
. You need to convert this to meters, the unit used for the value of the speed of light.
E
=
6.626
⋅
10
−
34
J
s
⋅
3
⋅
10
8
m
s
−
575
⋅
10
−
9
m
=
3.46
⋅
10
−
19
J
Explanation:
Brainliest please?
Is smog a pure substance
Answers
Actually, interesting enough, smog is an example of a heterogeneous mixture. So no, it's not a pure substance.
Answer:
No, smog is not a pure substance.
Explanation:
Smog is a heterogeneous mixture, heterogeneous mixtures contain two or more phases.
Hope this helped :)
You have 0.21 moles of Al how many atoms do you have
Answers
Number of atoms : 1.26 x 10²³
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
0.21 moles of Al, so n = 0.21
Number of atoms :
[tex]\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}[/tex]
Which of the following statements best explains why some of the offspring
have white flowers?
Answers
Answer: C.
Explanation: These offspring inherited a DNA sequence coding for white flowers from each parent plant.
:)
I need help :(((((((((((((((
Answers
WHICH DEFINTIOION GOES TO EACH LETTER/WORD. FILL IN THE BLANK
-
The place inside Earth where the energy is an earthquake is centered is the ________.
-
The instrument used to record earthquake activity is a/an __________.
-
The __________ of an earthquake is the point on the surface of Earth directly above the focus.
-
The __________ of an earthquake is based on the amplitude of the seismic waves.
-
An undersea earthquake may produce a/an _________.
-
Buildings constructed to withstand most earthquakes are said to be _________ ________.
-
_______ is magma that has flowed onto Earth's surface.
-
The __________ is divided into about 13 major plates.
-
________ are long cracks produced at divergent plate boundaries.
-
The __________ scale measures the magnitude of an earthquake.
-
The seismic waves that do the most damage to structures and property during an earthquake are _________ _________.
-
An avalanche of glowing rocks flowing on a cushion of hot gases is called a/an ___________ __________.
-
A large, broad volcano with gently sloping sides that is formed by the build-up of basaltic layers is a ________ volcano.
-
A relatively small volcano formed by moderate to explosive eruptions of tephra is a _________________ volcano.
-
A steep-sided volcano formed from alternating layers of violent eruptions of tephra and quieter eruptions of lava is a ___________ volcano.
-
The movement of the ground that occurs when rocks inside Earth pass their elastic limit, break suddenly, and experience elastic rebound is called a/an ______________.
-
A fracture that occurs when rocks break and that results in relative movement of opposing sides is called a ________.
A.
lava
B.
fault
C.
seismic safe
E.
shield
F.
cinder-cone
G.
focus
H.
tsunami
I.
rifts
J.
seismograph
K.
hot spot
L.
surface waves
M.
epicenter
N.
Richter
O.
lithosphere
P.
earthquake
R.
composite
T.
magnitude
Answers
What mass of zinc will completely react with 18.9 L of oxygen gas at 15°C and 1.50 atm pressure to produce zinc oxide. Remember to write a balanced. equation and fill in what is needed to answer this question on the BCA table.
Answers
Answer:
Mass of zinc react with oxygen = 156.91 g
Explanation:
Given data:
Volume of oxygen = 18.9 L
Temperature = 15°C
Pressure = 1.50 atm
Mass of zinc react with oxygen = ?
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Number of moles of oxygen:
PV = nRT
1.50atm ×18.9 L = n× 0.0821 atm.L / mol.K × 288 K
28.35 atm.L = n× 23.64atm.L / mol
n = 28.35 atm.L / 23.64atm.L / mol
n = 1.2 mol
Now we will compare the moles of oxygen and Zn.
O₂ : Zn
1 : 2
1.2 : 2/1×1.2 = 2.4 mol
Mass of zinc required:
Mass = number of moles × molar mass
Mass = 2.4 mol × 65.38 g/mol
Mass = 156.91 g
At which point is potential energy greatest
Answers
Answer:
W has the most potential energy
How many moles are equal to 12.65 grams of Al2(SO4)3?
Answers
Answer:
0.03697 mol Al₂(SO₄)₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:
Step 1: Define
12.65 g Al₂(SO₄)₃
Step 2: Identify Conversions
Molar Mass of Al - 26.98 g/mol
Molar Mass of S - 32.07 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of Al₂(SO₄)₃ - 2(26.98) + 3(32.07) + 12(16.00) = 342.17 g/mol
Step 3: Convert
[tex]12.65 \ g \ Al_2(SO_4)_3(\frac{1 \ mol \ Al_2(SO_4)_3}{342.17 \ g \ Al_2(SO_4)_3} )[/tex] = 0.03697 mol Al₂(SO₄)₃
Step 4: Check
We are given 4 sig figs. Follow sig fig rules and round.
We already have 4 sig figs in the final answer, so no need to round.
How many molecules are in 33.6 liters of neon (Ne) gas at STP?
Answers
Answer:
moles or atoms?
Explanation:
you can't have a molecule of any so there's two different answers that I can give you:
how many moles? 1.5
how many atoms? 9.03x10^23 atoms
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms
9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.
What is atom?The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.
Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.
At STP 1 mole of an ideal gas occupies 22.4L.
33.6 L x 1 mol/22.4 L = 1.5 moles of Neon
1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms
Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.
To learn more about atom, here:
brainly.com/question/29712157
#SPJ6
what is the relationship between the thickness of the book and the ability of the magnet to hold on to and attract the paper clips?
Answers
Answer:
The thicker the metal, the harder it is for the magnet to attract more paper clips.
Explanation:
There exists a relationship between the paper and the paper clip. The more is the thickness of the paper the stronger the paper clip will be. As size has the ability to attract and affect.
In another sense the stronger is the metal of the paper clip the tighter will be the element of the magnet Thus more will be the ability of the magnet to keep hold of the paper. Hence the closer is the magnet the more is the grip.Learn more about the relationship between the thickness of the book.
brainly.ph/question/4895114.
How many grams of water can be produced when 8 g of hydrogen react with 32 g oxygen?
Answers
Answer
[tex]--------------------------------------------[/tex]
According to Toppr, [tex]2\cdot2=4g[/tex] of hydrogen reacts with [tex]1\cdot32=32g[/tex] of oxygen to form [tex]2\cdot18=36g[/tex] of water. Hence, [tex]44=1g[/tex] of hydrogen reacts with [tex]432=8g[/tex] of oxygen to form [tex]436 = 9g[/tex] of water. [tex]9[/tex] grams of water can be produced when [tex]8[/tex]g of hydrogen reacts with
[tex]--------------------------------------------[/tex]
Hope this helps! <3
[tex]--------------------------------------------[/tex]
Why does nitrogen have stronger attractive forces between its nucleus and valence electrons than phosphorus?
Answers
Answer:
Nitrogen atom is small in size than phosphorus thus the bond between its nucleus and valence electrons are stronger than phosphorus.
Hope it helps...｡◕‿◕｡